Forceps



S; T. COHANE.

FORCEPS.

APPLICATION FILED MAR 4.1920.

Patented Apr. 26, 1921.

UNITED STATES, PATENT OFFICE.

SYLVESTER T. COHANE, OF HARTFORD, CONNECTICUT.

FORCEI'S.

To all whom it may concern:

Be it known that I, SYLvnsTER- T. COHANE, a citizen of the-United States residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Forceps,

of which the following is a specification.

This invention relates to forceps such as used by dentists. The instrument of my invention is duplex in character being convertible so that it can be readily and quickly changed from a condition adapting it to extract one or more teeth from'the upper jaw to one or more teeth from the lower jaw or vice versa. The article is susceptible of inexpensiveconstruction and when its parts are assembled, it ossesses all the strength of the present implement and can be readily used. As a matter of fact it can be employed exactly as is the instrument at present in everyday use yet obviously as I have observed it has a far greater range of possibilities.

In the drawings accompanying and forming part of the present specification I have shown in detail one of the several forms of embodiment of the invention which to en able those skilled in the art to practise the same will be set forth fully in the following description. I am not restricted to this disclosure as I may depart therefrom in several respects within the scope of the inventlon different scales. I

The instrument involves in its make up two members the levers 2 and 3 answering satisfactorily in this connection. The levers 3 may as shown, be outwardly bowed or I curved between their ends and milled or roughened on their outer surfaces as more or less common in the usual type of forceps.

The head end portion of each lever is mortised as at 4: near the opposite ends thereof Specification of Letters Patent. Patented Apr. 26 1921 Application filed March 4, 1920. Serial No. 363,144;

the under side ofeach mortise being flattened as at 5. I It will be understood that the mortised portions 4 are alternately flexibly connected and at this time a flat surface 5 will engage against a like fiat surface of the respective levers opposite ends of which are shown as in assembled relation in Figs. 1, 2 and 3. Each of the levers is provided as shown with a pivot or stud 6 rising from one of the flat surfaces 5 thereof the bodies of the respective pivots or studs being practically cylindrical while their heads 7 as illustrated are elliptical or virtually so, their longitudinal axes being transverse to the axis of the lever which carries them. As will be understood each of the two levers as 2 and 3 carries a pivot or stud 6 near one of its ends and about midway of one ofthe flat bearings and engaging surfaces 5, the other surfaces having slots or openings 8 practically of elliptical form which receive the respective studs the slots or openings 8 extending through the mortises or rabbets to which I have referred.

In Fig. l the two levers 2 and 3 are shown as assembled. When in this relation two fiat surfaces 5 will be superimposed. To disconnect the levers they are brought practically to right angular relation with each other as indicated by dotted lines. When this is accomplished the elliptical hole or slot 8 is brought into exact register with the reversed condition is desired the two levers are brought into right angular relation to which I have alluded, and the other headed stud or pivot 6 projected through the second cotiperating slot or opening 8, the levers being then brought into the engaging relation in the manner set forth to bring a flat face of a lever against a flat face of the other lever when they are brought into working relation as shown for instance in Fig. 3.

The levers 2 and 3 terminate at their ends in angular jaw portions 9 which are shaped in the customary fashion but which extend oppositely to adapt one pair such as that shown on the right in Fig. 2 to the upperset of teeth while the one on the left is intended to cotiperate with the lower set of teeth. 7

I have termed the invention forceps for the reason that the article has been found of particular utility in this especial field.

It is possible that the construction may be I used in other connections. For instance the aw members may be of such a shape to adapt the instrument to act as duplex pliers or for other analogous uses.

What I claim is:

1. An implement of the class described, comprising levers each having a jaw member at its ends and means for interchangeably pivotally connecting the levers to put cooperating jaw members alternately into operative relation with each other.

. 2. Dental forceps comprising levers each equipped with a jaw member atits ends,

teeth, and the other to a lower set of teeth,

the levers having headed studs near their ends, the heads of the studs being of elliptical formation, and the levers having elliptical slots to alternately receive the-studs;

In testimony whereof I aifix my signature in the presence of two witnesses.

SYLVESTER T. CGHANE, Witnesses:

Ensm M. RABENSTEIN, HEATH SUTEEERLAND. 

